A family friend(mechanic) told me he could hear my valves were off when I step on it, my cutout has been open the past few weeks. Well I know the drivers side has a really good chance at being off because I had to take the head off after I broke a bolt in it. Ok so here's the question the front and back cylinder seem fine, I touch the spark plug boot and can't feel anything. The middle two when I touch the spark plug boot I can feel a vibration so does that mean I just need to go back and adjust those? Also I found out my number 8 sparkplug is loose that could cause the car to afterfire right?

 

Ok I just went back over all the spark plugs and all are tightened. It feels like something is hitting the number 4 plug though when I have my car running and I touch the spark plug wire boot. I have a new coil, and icm. the car after fires and misses when put under a load above 2500 rpms